Masashi Kitazawa, a sophomore in high school, had a trauma. The trauma is that I was fat when I was a child!

Kitazawa, who diligently dieted and worked hard in middle school, grew up to be a handsome man and was supposed to lead a peaceful school life, but... In the new semester of high school, handsome men and beautiful girls have gathered in Kitazawa's 2nd grade class A for some reason. What's more, he received a secret invitation from Ayame Yagyu, the most beautiful girl in her grade...!?